Picture and text size in full screen mode

[ujoujoujo]

I dont understand the behaviour of the zoom function in full screen mode. I use separate monitor for Spotify and I look at it from some distance, so I need bigger font size, so I can read the artist and song name. When I zoom in, the text is bigger, but the picture shrinks to ridiculous size.

Can someone tell me please, how do I get bigger text size and big enough picture at the same time?